Hardness Calibration Test Blocks Manufacturer in Delhi, Hardness Calibration Test Blocks Suppliers in Delhi, Hardness Calibration Test Blocks in Delhi. We are offering Hardness Test Block for testing as a spare of Hardness Testing Machines. We have a wide range of all types of Hardness Test Blocks. Quality is ensured by maintaining superior surface finish, material homogeneity and good packing for ensuring long life. Typically, you should test and verify your hardness testing system daily against a New age test block.